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 Yucca subsp. var.  
Joshua Tree
Habit: tree
Height: to
Width: to
Height: cm to warning.png"" cannot be used as a page name in this wiki.
Width: warning.png"" cannot be used as a page name in this wiki. to warning.png"" cannot be used as a page name in this wiki.
Lifespan: perennial
Origin: N America
Exposure: sun
Hidden fields, interally pass variables to right place
Minimum Temp: °Fwarning.png"°F" is not a number.
USDA Zones: to
Sunset Zones: varies by species
Flower features:
Agavaceae > Yucca var. ,

Standard Cyclopedia of Horticulture

Yucca (Yuca, native name for the manihot or cassava, erroneously applied to the present plants by Gerarde). Liliaceae, tribe Yucceae. Bold stiff-leaved plants suitable for lawn planting, subtropical massing, and a few of them for flower-garden use.

Acaulescent to arboreous endogens with fibrous evergreen sword-shaped lvs. usually pungent and often denticulate or fibrous on the margin: fls. white or shaded with cream or violet, cup- or saucer-shaped, usually pendent in large usually erect panicles, opening at night and then somewhat sickishly fragrant; pollination rarely occurs except through the aid of a small white moth, Pronuba yuccasella, found wherever yuccas occur wild on the continent, which deliberately gathers the pollen and thrusts it into the stigmatic chamber, its larvae feeding exclusively on the maturing seeds of these plants: fr. either capsular and erect or fleshy and hanging in the principal groups or sub-genera.—About 30 species, confined to N. Amer. and the W. Indies, most of them native to the arid S. W. U. S. and the Mexican tableland. A few species have been cult. for centuries, and within the last decade a large number of artificial hybrids have been produced and intro. into cult., especially along the Medit. There are recent monographs by the writer in Rep. Mo. Bot. Card., Vol. 13, pp. 42-116, with illustrations, and by Molon in a small manual "le Yucche," Milano, 1914, in which many of the Sprenger hybrids are also figured. See Hesperoyucca, Samuela.

Propagation is by seeds, offsets, stem-cuttings or rhizome-cuttings. These should be planted in well-drained sandy loam, usually in the succulent house. The only species hardy where frost is severe are Y. glauca, Y. filamentosa, Y. flaccida, Y. baccata, Y. recurvifolia, and Y. gloriosa, which flower in the sequence given, the last-named often blossoming late in autumn. Y. Treculeana shows considerable resistance to frost. The tender species are kept in the cactus house. Well-drained sandy loam suits yuccas best, but with good drainage they are tolerant of a large range of soil and exposure. Y. Treculeana blooms usually in March in plant-houses, as when wild, and the Mexican species when brought to flower are usually spring bloomers, but they often refuse to flower for long periods and then suddenly and unexpectedly produce an abundance of simultaneous bloom, even on the smaller plants. Of the hardy species, Y. glauca flowers in June and it is quickly followed by Y. filamentosa and Y. flaccida, while the forms of Y. gloriosa, which usually flower only at intervals of several years, bloom from late August to so late in the autumn as to be cut down by frost. The only well-known yucca in northern gardens is the common Adam's needle, Y. flaccida. This persists for years, sending up a tall panicle of cream-white flowers in late spring; or early summer. All yuccas are suited to bold and formal effects in gardening; as tub specimens they may be used effectively in subtropical bedding or massing.

Most yuccas may be fertilized if fresh pollen is transferred directly from the anther to the stigmatic cavity of a newly opened flower, preferably one seated directly on the main shaft, where nutrition is more certain. Y. aloifolia commonly fruits freely, but the others rarely fruit spontaneously in cultivation except Y. filamentosa and Y. flaccida, which are pollinated by the small white moth (Pronuba yuccasella) that accompanies them when cultivated in the western states, but emerges from the pupa too late to pollinate Y. glauca and disappears top early for Y. gloriosa. See Rep. Mo. Bot. Gard. 3:99; 4:181, for additional discussion.

The great yuccas, or "yucca palms," of southern California are chiefly Y. arborescens. They grow in the higher lands bordering the Mojave and adjacent deserts, reaching a height of 15 to 20 feet. The old plants are exceedingly weird and picturesque. Occasionally this species is transferred to gardens, but it is apparently not in the trade. This "Joshua tree" is now separated as Clistoyucca arborescens, Trelease; as it is not in cultivation, it need not be discussed further here except to say that Clistoyucca differs from Yucca in its very short style, fleshy incurved perianth, and spongy dry indehiscent fruit.

Y. Draco – Y. flaccida X Y. aloifolia.— Y. karlsruhensis – Y. filamentosa X Y. glauca. — Y. rekowskiana –Y. filamentosa X Y. gloriosa. — Y. Whipplei - Hesperoyucca.

The above text is from the Standard Cyclopedia of Horticulture. It may be out of date, but still contains valuable and interesting information which can be incorporated into the remainder of the article. Click on "Collapse" in the header to hide this text.

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Yucca aloifolia Aloe yucca, Spanish Bayonet
Joshua Tree in Joshua Tree National Park.jpg Yucca brevifolia flower.jpg Yucca brevifolia Joshua tree
Yucca constricta Buckley's yucca
Yucca baccata whole.jpg Yucca baccata close.jpg Yucca baccata Banana yucca, datil
Yucca decipiens.jpg Yucca decipiens 2.jpg Yucca decipiens Palma China
Yucca elata blooming.jpg Yucca elata flowers.jpg Yucca elata Soaptree yucca
Yukka filamentosa.jpg Yucca filamentosa1.jpg Yucca filamentosa Spoonleaf yucca, Filament yucca, or Adam's Needle
Yucca filifera Palma Chuna yucca
Yucca flaccida.jpg Yucca flaccida Flaccid leaf yucca
Yucca glauca soapweed MN 2007.JPG Yucca glauca Sinijukka VII08 H6193.jpg Yucca glauca Great Plains yucca
Yucca gloriosa Moundlily yucca, Adam's needle, Spanish Dagger
Yucca grandiflora Sahuiliqui yucca
Yucca guatemalensis Spineless yucca
Yucca harrimaniae Harriman's yucca
Yucca intermedia Intermediate Yucca
Yucca jaliscensis Izote
Yucca kanabensis Kanab yucca
Yucca lacandonica Tropical yucca
Yucca madrensis Soco yucca
Yucca nana Dwarf yucca
Yucca pallida.jpg Yucca pallida Pale yucca
Yucca periculosa Izote
Yucca recurvifolia Curve-leaf yucca
Yucca rigida Blue yucca
Yucca rostrata.jpg Yucca rostrata Big Bend yucca
Yucca rupicola.jpg Yucca rupicola Texas yucca, or Twist-leaf yucca
Yucca schidigera blooming.jpg Yucca schidigera Mojave yucca
Yucca schottii Hoary yucca or Mountain yucca
Yucca smalliana Adam's needle, Bear's grass
Yucca standleyi
Yucca brooklyn.jpg Yucca thompsoniana Thompson's Yucca
Yucca thornberi
Yucca torreyi 1.jpg Yucca torreyi Torrey yucca
Yucca treculiana Texas bayonette, Trecul's yucca
Yucca valida Datilillo
Yucca whipplei Our Lord's Candle
Yucca yucatana Yucatan yucca

Some species which used to be classified as Yucca have been moved to the genera Dasylirion, Furcraea, Hesperaloe, Hesperoyucca and Nolina.


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